<template>
  <view>
    <!-- 使用自定义搜索组件 -->
    <!-- <my-search :bgcolor="'pink'" :radius="'3'"></my-search> -->
    <my-search @click="gotoSharch()"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧分类区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{ height: deviceHeight + 'px' }">
        <block v-for="(item, index) in cateList" :key="index">
          <view :class="['left-scroll-view-item', index === active ? 'active' : '']" @click="activeChange(index)">{{ item.cat_name }}</view>
        </block>
      </scroll-view>
      <!-- 右侧分类区域 -->
      <scroll-view class="right-scroll-view" scroll-y="true" :scroll-top="scrollTop" :style="{ height: deviceHeight + 'px' }">
        <view class="cate_lv2" v-for="(item2, index2) in cateLevel2" :key="index2">
          <!-- 二级分类的标题 -->
          <view class="cate_lv2_title">/ {{ item2.cat_name }} /</view>
          <!-- 三级分类的列表 -->
          <view class="cate_lv3_list">
            <!-- 三级分类的item项 -->
            <view class="cate_lv3_item" v-for="(item3, index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
              <!-- 三级分类图片 -->
              <image :src="item3.cat_icon" mode="widthFix"></image>
              <!-- 三级分类的文本 -->
              <text>{{ item3.cat_name }}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      // 当前设备可用高度
      deviceHeight: 0,
      cateList: [],
      active: 0,
      // 二级分类列表
      cateLevel2: [],
      // 滚动条距离顶部的距离
      scrollTop: 0
    };
  },
  onLoad() {
    // 获取系统信息
    const sysInfo = uni.getSystemInfoSync();
    this.deviceHeight = sysInfo.windowHeight - 50;
    // 获取分类列表的数据
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await uni.$http.get('/api/public/v1/categories');
      // 请求失败
      if (res.meta.status !== 200) return uni.$showMsg();

      this.cateList = res.message;
      this.cateLevel2 = res.message[0].children;
    },
    activeChange(i) {
      this.active = i;
      // 为二级分类重新赋值
      this.cateLevel2 = this.cateList[i].children;
      // 此处值为0时滚动条置顶不生效
      // this.scrollTop = 0
      this.scrollTop = this.scrollTop === 0 ? 1 : 0;
    },
    // 跳转商品列表页面
    gotoGoodsList(item3) {
      uni.navigateTo({
        url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
      });
    },
    gotoSharch() {
      console.log('OK');
      uni.navigateTo({
        url: '/subpkg/search/search'
      });
    }
  }
};
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  .left-scroll-view {
    width: 120px;
    .left-scroll-view-item {
      background: #f7f7f7;
      line-height: 60px;
      font-size: 12px;
      text-align: center;
      &.active {
        background: #f0f0f0;
        position: relative;
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background: #c00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate_lv2_title {
    font-size: 12px;
    text-align: center;
    font-weight: bold;
    padding: 15px 0;
  }
  .cate_lv3_list {
    display: flex;
    flex-wrap: wrap;
    .cate_lv3_item {
      width: 33.3%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      image {
        width: 60px;
        height: 60px;
      }
      text {
        font-size: 12px;
      }
    }
  }
}
</style>
